Compressor

ABSTRACT

The invention relates to a compressor for refrigerant having a compressor housing, said compressor housing being provided with a suction inlet and a pressure outlet, said compressor comprising a compression unit, arranged in a compression housing section of said compressor housing and an electric motor arranged in a motor housing section of said compressor housing, said electric motor comprising a stator arranged within a stator receiving sleeve of said motor housing section and a rotor surrounded by said stator and arranged on a drive shaft of said electric motor for rotation about an axis of rotation together with said drive shaft, said stator comprising a stator core having a stack of laminations and extending parallel to said axis of rotation from a first front side to a second front side, said stator having windings extending through said stator core and forming end windings arranged in front of said front surfaces, and a channel for guiding at least a portion of said refrigerant entering through said suction inlet along an outer side of said stator before entering said compression unit.

CROSS-REFERENCE TO RELATED PATENT APPLICATION

This application is a continuation of U.S. patent application Ser. No.15/902,374, filed Feb. 22, 2018, which is a continuation ofInternational application number PCT/EP2015/069703 filed on Aug. 27,2015.

This patent application claims the benefit of U.S. patent applicationSer. No. 15/902,374, filed Feb. 22, 2018 and International applicationNo. PCT/EP2015/069703 of Aug. 27, 2015; the teachings and disclosure ofeach of which are hereby incorporated in their entirety by referencethereto.

BACKGROUND OF THE INVENTION

The invention relates to a compressor for refrigerant having acompressor housing, said compressor housing being provided with asuction inlet and a pressure outlet, said compressor comprising acompression unit, arranged in a compression housing section of saidcompressor housing and an electric motor arranged in a motor housingsection of said compressor housing, said electric motor comprising astator arranged within a stator receiving sleeve of said motor housingsection and a rotor surrounded by said stator and arranged on a driveshaft of said electric motor for rotation about an axis of rotationtogether with said drive shaft, said stator comprising a stator corehaving a stack of laminations and extending parallel to said axis ofrotation from a first front side to a second front side, said statorhaving windings extending through said stator core and forming endwindings arranged in front of said front surfaces, and a channel forguiding at least a portion of said refrigerant entering through saidsuction inlet along an outer side of said stator before entering saidcompression unit.

A channel for guiding at least a portion of refrigerant can be any paththrough which refrigerant can flow in a certain direction of flowirrespective of any existing or non-existing limitation in directiontransverse to said direction of flow.

Such compressors are known from the prior art. According to said knownconcepts the stator receiving sleeve is provided with stator supportelements whereas the stator core is usually provided with a cylindricalouter surface abutting on said stator support elements of said statorreceiving sleeve.

These known concepts require complicated machining processes and havefurther restrictions with respect to the assembly of the electric motorin the housing.

In particular in the known concepts it is necessary to have an outerdiameter of the end windings to be reduced with respect to an outerdiameter of the stator core in order to avoid collision with said statorsupport elements during assembly.

It is therefore the object of the present invention to improve acompressor according to the aforementioned features in order to simplifythe machining and assembly thereof.

SUMMARY OF THE INVENTION

This object is solved by a compressor as mentioned before having thestator core provided with at least two stator support elements fixed tosaid stator core and extending in radial direction of said axis ofrotation beyond an outer surface of said stator core for support of saidstator on an inner sleeve surface of said stator receiving sleeve.

The advantage of the inventive solution has to be seen in the fact thathaving the stator support elements arranged on the stator core machiningof the inner sleeve surface of said housing sleeve is simplified whereasthe provision of said stator support elements on said stator coreenables use of simplified manufacturing processes.

In addition the fact that the stator support elements are fixed to saidstator core enables an improved cooling of said stator core by said flowof refrigerant through said flow guiding channels extending along saidstator support elements of said electric motor.

The inventive concept allows to increase the flow cross section withoutincreasing the outer diameter or length of the housing sleeve or todecrease the outer diameter or length of the housing sleeve bymaintaining the flow cross section.

It is of particular advantage if said outer side of said stator isprovided by outer surfaces of said end winding of said stator and anouter surface of said stator core extending between said end winding ofsaid stator.

Further the outer surfaces of said end windings could be arranged at asmaller radial distance from said axis of rotation than said outersurface of said stator core.

It is of particular advantage if the outer surface of said winding endsis arranged more or less flush with said outer surface of said statorcore.

In this connection more or less flush means that the radial distancefrom said axis of rotation of said outer surface of said end windings isequal to said radial distance of said outer surface of said stator coreor greater than 95% of said radial distance of said outer surface ofsaid stator core.

It is of particular advantage if said radial distance from said axis ofrotation of said outer surfaces of said end windings is greater than 98%of said radial distance of said outer surface of said stator core.

However it is of advantage if said outer surface of said stator core isflush with said outer surfaces of that winding ends in order to obtainan undisturbed flow of refrigerant and therefore increase efficiency ofcooling-off said outer surfaces of said winding ends.

Having the outer surface of said winding ends flush with said outersurface of said stator core enables an increase of said inner surfacesof said end windings which provides more space for the arrangement of abearing system together with a bearing sleeve as close as possible tosaid rotor.

Such a design enables to reduce the length of the motor and/or the loadon the bearing system due to the arrangement of the stator closer to thebearing system.

With respect to the design of said stator support elements no furtherdetails have been given till now.

It is of particular advantage if said stator support elements areprovided with radially outer support surfaces abutting on said innersleeve surface of said housing sleeve.

It is of particular advantage if said outer support surfaces of saidstator support elements are abutting on said inner sleeve surface byforming a friction fit or even a press fit.

One preferred solution provides that said stator support elements areformed by protrusions of laminations of said stator core extendingbeyond said outer surface of said stator core.

In this case the protrusions are preferably manufactured as beingintegral or one piece with said laminations forming said core andstacking the laminations provided with protrusions leads to forming ofsaid stator support elements.

In principle a simple design provides the said stator support elementsextend from one front side of said stator core to the other front side,in particular in a direction parallel to said axis of rotation.

However it is possible to provide stator support elements having areduced extension parallel to said axis of rotation, for example by onlyproviding part of said laminations forming said stator core withprotrusions forming said stator support elements.

For example it would be possible to form said stator support elements bysome protrusions of laminations adjoining a front side which are thenfollowed by laminations without protrusions and thereafter followed bylaminations having again protrusions, in particular the laminationsadjoining the other front side.

Further a preferred and simplified solution provides stator supportelements extending only parallel to said axis of rotation.

However the stator support elements could also be designed as curvedstator support elements, extending with one component in direction ofsaid axis of rotation but also with another component with an increasingangle of rotation about said axis of rotation so that for example thestator support elements can have a shape like a pitch of a screw.

Another advantageous solution provides that said stator support elementsare fixed onto said stator core as being separate elements.

In this case the stator core is formed by laminations having an outercontour which for example is basically cylindrical and on said outercontour said stator support elements are arranged and fixed thereto.

For example it would be possible to weld said stator support elementsonto said outer contour of said stator core.

In this case the stator support elements could be for example designedas elements having the solid or massive cross section.

However it is of advantage if the stator support elements are designedas hollow elements and in particular providing an additional flowguiding channel which is extending through said stator support elements.

Such a design allows to increase the flow cross section withoutincreasing the diameter of the housing sleeve or to decrease thediameter of the housing sleeve by maintaining the flow cross section.

For example the stator support elements could be tube like or have anydesired shape forming such an additional flow guiding channel.

One design which is of particular advantage provides that said statorsupport elements are U-shaped.

A design which is of specific advantage provides that said statorsupport elements comprise two foot sections fixed to the stator core andflange sections adjoining said foot sections and extending up to abridging section arranged at a distance from an outer surface of saidstator core.

In this case the stator support elements provide the additional flowguiding channel by having this additional flow guiding channel arrangedbetween said bridging section and an area of the outer surface of thestator core covered by said bridging section as well as between said twoflange sections.

In particular in such a design the foot sections are welded to saidouter surface of said stator core.

In general it would be of advantage if the stator support elements arearranged about said axis of rotation at identical angular distance fromeach other in order to provide a symmetrical support of said stator corewithin said housing sleeve.

Further it is of particular advantage if there are more than two statorsupport elements provided.

For example it would be possible to provide at least three statorsupport elements on said stator.

One preferred solution provides four stator support elements on saidstator core enabling a symmetrical support of said stator core withinsaid housing sleeve.

With respect to said inner sleeve surface of said housing sleeve themachining for said inner sleeve surface is simplified if said innersleeve surface is a cylindrical surface such a cylindrical surface havein general a variety of cross sections which need not necessarilycircular.

However it is of specific advantage if said inner sleeve surface has acircular cross section because then insertion of said stator having astator core with said stator support elements is simplified.

The present invention is not limited to a suction gas cooled motor, itapplies also for example to a pressure gas cooled motor to any of thekind of gas cooled motor.

Further advantageous features of the present invention are disclosed inconnection with the detailed specification of several embodiments of acompressor according to the present invention in the figures.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a perspective view of a compressor for refrigerant;

FIG. 2 shows a cross sectional view along lines 2-2 in FIG. 1;

FIG. 3 shows a cross sectional view along lines 3-3 in FIG. 2;

FIG. 4 shows a cross sectional view along lines 4-4 in FIG. 2;

FIG. 5 shows a perspective view of a stator according to a firstembodiment;

FIG. 6 shows a view in direction A in FIG. 5;

FIG. 7 shows a view similar to the one of FIG. 6 of a second embodimentaccording to the present invention;

FIG. 8 shows a perspective view of a stator according to a thirdembodiment according to the present invention;

FIG. 9 shows an enlarged view of area B in FIG. 8;

FIG. 10 shows a front view along arrow C in FIG. 8;

FIG. 11 shows a perspective view of a fourth embodiment according to thepresent invention;

FIG. 12 shows an enlarged view of area D in FIG. 11 and

FIG. 13 shows a front view along arrow E in FIG. 11.

DETAILED DESCRIPTION OF THE INVENTION

A compressor 10 for refrigerant, as shown in FIG. 1, comprises acompressor housing 12 extending in a longitudinal direction 14, saidcompressor housing comprising a motor housing section 16 a compressionsection 22 and a high-pressure housing section 24 arranged in sequencein said longitudinal direction 14.

As shown, for example in FIGS. 1 and 2, motor housing section 16 isprovided on its side opposite to said compression housing section 22with a cover 26 releasable connected to a motor housing sleeve 28,surrounding a receptacle 32 within said motor housing section 16receiving an electric motor 34.

Electric motor 34 itself comprises a stator 36 arranged in saidreceptacle 32 and supported by said housing sleeve 28 and fixed thereto,as well as a rotor 38 arranged to be surrounded by said stator 36.

Said rotor 38 is mounted on a compressor drive shaft 42 extendingthrough said rotor 38 and from said rotor 38 extending to a compressionunit 44 in order to drive one or more compression elements 46, forexample a pair of screws. However the compression element 46 can also bea piston or a scroll or another kind of compression element.

Drive shaft 42 is preferably rotatably mounted about an axis of rotation52 by a bearing system 54 arranged between said compression unit 44 andsaid electric motor 34 and comprising for example several rollerbearings 56, 58 spaced apart from each other in said longitudinaldirection 14 and held by a bearing sleeve 62 which is for example formedas an integral part of compressor housing 12.

In the particular embodiment drive shaft 42 with its rotor supportingsection 72 is merely supported by bearing system 54 and its free end 74,arranged on a side of said rotor supporting section 72 opposite to saidbearing system 54 is arranged free of support with respect to compressorhousing 12.

Other solutions having additional bearings on the rotor supportingsection 72 and/or on the free end 74 are also possible.

Stator 36 comprises, as for example shown in FIGS. 2 and 3 a stator core82 made of a stack of laminations 84 stacked in a direction parallel tosaid axis of rotation 52, said stack extending from a first front side86 of said rotor core 82 to a second front side 88 of said rotor core.

Stator core 82 is further provided with windings of electrical coresextending through said stator core 82 and forming end windings 92, 94,arranged outside said stator core 82 and in front of said front sides86, 88.

In order to supply refrigerant to said compressor 10 compressor housingis provided with a suction inlet 102 arranged on cover 26 for supplyingrefrigerant to be compressed to said receptacle 32 of said electricmotor 34 in order to cool said electric motor 34 by a flow ofrefrigerant 104 entering receptacle 32 through suction inlet 102 andforming an outer flow 106 flowing through a flow guiding channel 112formed by an inner sleeve surface 114 of said housing sleeve 28 and anouter side 116 of said stator 36, said other side 116 being formed byouter surfaces 122 and 124 of said end windings 92, 94 which aredirected towards said inner surface 114 of said housing sleeve 28 andbetween the end windings 92, 94 formed by an outer surface 126 of saidstator core 82.

Preferably flow of refrigerant 104 does not only form an outer flow ofrefrigerant 106 but also an inner flow of refrigerant 132 flowing alongan inner surface 134, 136 of the respective end winding 92, 94 andbetween the end windings 92, 94 through a gap 138 between stator 36 androtor 38.

The outer flow 106 first cools end winding 92, which is directed towardscover 26 by flowing along its outer surface 122, then cools stator core82 by flowing along its outer surface 126 and finally cools end winding94 by flowing along its outer surface 124, which end winding 94 isdirected towards compression unit 44.

Thereafter outer flow 106 enters a transition opening 142 through whichouter flow 106 can leave receptacle 132 and enter into compression unit44.

Preferably inner flow 132 first cools inner surface 134 of end winding192, then extends through gap 138 and finally cools inner surface 136 ofend winding 94 and thereafter leaves receptacle 32 through transitionopening 142 for entering into compression unit 44.

Refrigerant compressed by said compression unit 44 exits housing 12through pressure outlet 144.

As shown in FIGS. 2 to 5 stator core 82 is provided with a plurality ofstator support elements 152 extending radially outward from stator core82 beyond outer surface 126 of stator core 82 and forming supportsurfaces 154 which are arranged radially outward of outer surface 126 ofstator core 82 and abutting on inner sleeve surface 114 of housingsleeve 28.

In particular inner sleeve surface 114 of stator sleeve 28 is acontinuous surface cylindrical with respect to axis of rotation 52 andhaving a circular cross section.

For example support surfaces 154 of stator support elements 152 aremachined in order to closely fit into inner sleeve surface 114 ofhousing sleeve 28 so as to precisely position rotor core 82 withinstator sleeve 28.

In the first embodiment as shown in FIGS. 2 to 6 the outer surfaces 122and 124 of end windings 92 and 94 are flush with the outer surface 126of stator core 82 which means that they are in the same radial distancefrom the axis of rotation 52 in order to improve the cooling at theouter surfaces 122, 124 of end windings 92 and to further enable inparticular to increase the radial distance of inner surfaces 134 and 136of end windings 92 and 94 which provides an increased space around driveshaft 42 so that bearing system 54 with bearing sleeve 62 can bearranged as close as possible to stator 38 in order to reduce the lengthof rotor supporting section 72 of drive shaft 42 extending from bearingsystem 54, which then improves the precision with which rotor 38 rotatesabout axis of rotation 52.

In order to fix stator core 82 against rotation within housing sleeve 28for example one of the stator support elements 152 can be provided withgroove 156 which groove 156 can cooperate with a correspondingprotrusion 158 or a corresponding tongue 158 arranged on housing sleeve28.

In a second embodiment, which is shown in FIG. 7, the outer surface 122of end winding 92 is reduced with respect to its radial distance fromaxis of rotation 52 with respect to outer surface 126 of stator core 82.

As far as all other features of these second embodiments are concernedthese features are provided with the same reference numerals so thatwith respect to the description thereof reference is made to theexplanations provided in connection with the first embodiment.

The stator support elements 152 according to the first and secondembodiments are obtained by protrusions of for example all laminations84 used for forming the stator core 82 which protrusions 162, when beingaligned with each other, form a continuous bead or ridge extendingparallel to the axis of rotation 52 between the front sides 86 and 88 ofstator core 82.

However the stator support elements 152 can be reduced in length by onlyproviding part of the laminations 84 with protrusions 62 or—forexample—by providing a first number and a last number of laminations 84with protrusions 162 so that the laminations 84 between the first numberand the second number have no protrusions 162.

Preferably protrusions 162 are formed integral with or as one piece withthe respective laminations 84 so that in the course of the process ofmanufacturing laminations 84 protrusions 162 are formed in the course ofthe same forming process as used for forming laminations 84.

Preferably laminations 84 are provided with four protrusions 162arranged at the same angular distance with respect to each other aroundaxis of rotation 52 so that these protrusions 162 can be manufacturedwith more or less no loss of the sheet of band material from whichlaminations 84 are manufactured, for example either by punching orcutting.

In a third embodiment all elements which are identical with the firstand second embodiment are provided with the same reference numerals sothat reference can be made thereto.

According to the third embodiment stator support elements 152′ are notintegral with stator core 82 but are made by formed metal sheet elements172, having two foot sections 174, 176 which for example are welded onstator core 82, in particular onto outer surface 126 of stator core 82,and from each foot section 174, 176 a flange section 184, 186 isextending away from the outer surface 126 of stator core 82 towards abridging section 188 connecting flange sections 184, 186 at its endsopposite to said foot sections 174, 176 and having a curved shape sothat in particular the bridging section 188 extends at a constantdistance from outer surface 126 of rotor core 82 and forms a supportsurface 154′ adapted to abut on the inner sleeve surface 114 of housingsleeve 28 with the same curvature with respect to axis of rotation 52 asthe inner sleeve surface 114 of housing sleeve 28.

According to the embodiment shown in FIGS. 8 to 9 the stator supportelements 152′ are arranged at the same angular distances with respect toaxis of rotation 52 on outer surface 126 of stator core 82.

Due to the fact that bridging section 188 extends at a distance fromouter surface 126 of stator core 82 the stator support elements 152′ bythemselves form a further flow guiding channel 192 extending betweenbridging section 188 and an area 194 of outer surface 126 covered bybridging section 188 and further between flange sections 184, 186 sothat in addition to the flow guiding channels 112, formed between statorsupport elements 152′, flow guiding channel 192 provides improvedcooling of stator core 82 in the area of the stator support elements152′.

According to the third embodiment stator support elements 152′ areextending parallel to axis of rotation 52 between front side 86 andfront side 88 of stator core 82 but can be also reduced with respect totheir longitudinal extension if they provide sufficient stability forpositioning of rotor core 82 within housing sleeve 28.

In addition stator support elements 152′ due to the fact that bridgingsection 188 extends in a radial distance from the surface area 194covered by bridging section 188 enables to provide the stator supportelements 152′ with certain radial elasticity so that support surfaces154′ can be moved at a certain elasticity with respect to stator core 82in order to obtain a force locking connection between stator supportelements 152′ and housing sleeve 28.

According to a fourth embodiment shown in FIGS. 11 to 13 rotor core 82is not provided with an even cylindrical outer surface 126 but outersurface 126 of stator core 128 is provided with longitudinal ribs 202extending parallel to axis of rotation 52 in order to increase thesurface for heat exchange between the outer flow 106 in flow guidingchannels 112 and flow guiding channels 192.

The longitudinal ribs 102 are preferably obtained by protrusionsintegral with the laminations 84 which protrusions when stackinglaminations 84 form longitudinal ribs 202 extending preferably parallelto axis of rotation 52.

1. Compressor for refrigerant having a compressor housing, comprising a motor housing section and a compression section, said compressor housing being provided with a suction inlet and a pressure outlet, said compressor comprising a compression unit, arranged in the compression section and an electric motor arranged in a receptacle provided by a motor housing sleeve of said motor housing section, said motor housing sleeve being a integral segment of said motor housing section and having an inner cylindrical surface and being provided on its side opposite to said compression section by a cover releasable connected to said motor housing sleeve, said electric motor comprising a stator arranged within the receptacle of said motor housing sleeve and a rotor surrounded by said stator and arranged on a drive shaft of said electric motor for rotation about an axis of rotation together with said drive shaft, said drive shaft being mounted rotatably about an axis of rotation by a bearing system arranged between said compression unit and said electric motor and mounted in a bearing support integral with said compressor housing, said stator comprising a stator core having a stack of laminations and extending parallel to said axis of rotation from a first front side to a second front side, said stator having windings extending through said stator core and forming end windings arranged in front of said front sides, the stator core is provided with at least two stator support elements integrally manufactured as one piece with laminations forming said stator core and extending in radial direction of said axis of rotation beyond an outer surface of said stator core for support of said stator on the inner cylindrical surface of said motor housing sleeve without a weld therebetween, said at least two stator support elements together with said inner sleeve surface and said outer surface of said stator core forming at least two channels for guiding at least a portion of said refrigerant entering through said suction inlet along an outer side of said stator before entering said compression unit, an angular span of each of the at least two channels for guiding said outer flow of said refrigerant being greater than a radially outermost angular span of any individual one of the at least two stator support elements, and wherein said at least two flow guiding channels extend along said stator support elements of said electric motor and guide said outer flow along said stator support elements of said electric motor and the stator core is rotationally fixed to the motor housing sleeve at a predetermined angular orientation.
 2. Compressor in accordance with claim 1, wherein said end windings of said stator and an outer surface of said stator extending between said end windings of said stator, and in an operative state an inner flow of refrigerant flows along an inner surface of the end windings and between the end windings through a gap between the stator and the rotor.
 3. Compressor in accordance with claim 1, wherein the outer surfaces of said end windings are arranged more or less flush with said outer surface of said stator core.
 4. Compressor in accordance with claim 1, wherein said outer surface of said stator core is flush with said outer surfaces of said end windings.
 5. Compressor in accordance with claim 1, wherein said stator support elements are provided with radially outer support surfaces abutting on said inner sleeve surface of said housing sleeve.
 6. Compressor in accordance with claim 1, wherein said stator support elements are formed by protrusions of laminations of said stator core extending beyond said outer surface of said stator core.
 7. Compressor in accordance with claim 1, wherein the stator support elements extend only parallel to said axis of rotation.
 8. Compressor in accordance with claim 1, wherein said stator support elements are arranged and fixed on an outer contour of said stator core.
 9. Compressor in accordance with claim 1, wherein the stator support elements are arranged about said axis or rotation at identical angular distances from each other.
 10. Compressor in accordance with claim 1, wherein more than two stator support elements are provided.
 11. Compressor for refrigerant having a compressor housing, comprising a motor housing section and a compression section, said compressor housing being provided with a suction inlet and a pressure outlet, said compressor comprising a compression unit, arranged in the compression section of said compressor housing and an electric motor arranged in the motor housing section of said compressor housing, said electric motor comprising a stator arranged within a receptacle of a motor housing sleeve of said motor housing section and a rotor surrounded by said stator and arranged on a compressor drive shaft of said electric motor for rotation about an axis of rotation together with said compressor drive shaft, said compressor drive shaft extending from said rotor to the compression unit in order to drive one or more compression elements and said compressor drive shaft is mounted rotatably about the axis of rotation by a bearing system arranged between said compression unit and said electric motor and mounted in a bearing support integral with said compressor housing, a rotor supporting section of said drive shaft is merely supported by said bearing system and its free end arranged on a side of said rotor supporting section opposite to said bearing system is arranged free of support with respect to the compressor housing, said stator comprising a stator core having a stack of laminations and extending parallel to said axis of rotation from a first front side to a second front side, said stator having windings extending through said stator core and forming end windings arranged in front of said front surfaces, the stator core is provided with at least two stator support elements fixed to said stator core and extending in radial direction of said axis of rotation beyond an outer surface of said stator core for support of said stator on an inner cylindrical sleeve surface of said motor housing sleeve, and wherein a flow guiding channel for guiding at least a portion of said refrigerant entering through said suction inlet as an outer flow of refrigerant along an outer side of said stator before entering said compression unit is provided, said flow of refrigerant through said flow guiding channel extends along said stator support elements of said electric motor.
 12. Compressor in accordance with claim 11, wherein said motor housing sleeve is an integral section of the motor housing section.
 13. Compressor in accordance with claim 11, wherein said outer side of said stator is provided by outer surface of said end windings of said stator and an outer surface of said stator extending between said end windings of said stator, and that said flow of refrigerant through an inner flow of refrigerant is flowing along an inner surface of the respective end windings and between the end windings through a gap between stator and rotor.
 14. Compressor in accordance with claim 11, wherein said inner sleeve surface is a cylindrical surface.
 15. Compressor for refrigerant having a compressor housing, said compressor housing being provided with a suction inlet and a pressure outlet, said compressor comprising a compression unit, arranged in a compression section of said compressor housing and an electric motor arranged in a motor housing section of said compressor housing, said electric motor comprising a stator arranged within a motor housing sleeve being an integral segment of said motor housing section and a rotor surrounded by said stator and arranged on a drive shaft of said electric motor for rotation about an axis of rotation together with said drive shaft, said stator comprising a stator core having a stack of laminations and extending parallel to said axis of rotation from a first front side to a second front side, said stator having windings extending through said stator core and forming end windings arranged in front of said front sides, the stator core is provided with at least two stator support elements fixed to said stator core and extending in radial direction of said axis of rotation beyond an outer surface of said stator core for supporting of said stator on an inner sleeve surface of said motor housing sleeve, said at least two stator support elements together with said inner sleeve surface and said outer surface of said stator core forming a plurality of flow guiding channels that extend along said stator support elements of said electric motor and for guiding at least a portion of said refrigerant entering through said suction inlet along an outer side of said stator before entering said compression unit, and further comprising a gap between the stator and the rotor for providing an inner flow of refrigerant flow along an inner surface of the end windings; and wherein the stator core is rotationally fixed to the motor housing sleeve at a predetermined angular orientation in a contact abutting manner between said stator support element and said inner sleeve surface.
 16. Compressor for refrigerant having a compressor housing, said compressor housing being provided with a suction inlet and a pressure outlet, said compressor comprising a compression unit, arranged in a compression section of said compressor housing and an electric motor arranged in a motor housing section of said compressor housing, said electric motor comprising a stator arranged within a motor housing sleeve of said motor housing section said motor housing sleeve being an integral segment of said motor housing section and a rotor surrounded by said stator and arranged on a drive shaft of said electric motor for rotation about an axis of rotation together with said drive shaft, said stator comprising a stator core having a stack of laminations and extending parallel to said axis of rotation from a first front side to a second front side, said stator having windings extending through said stator core and forming end windings arranged in front of said front sides, and a channel for guiding at least a portion of said refrigerant entering through said suction inlet along an outer side of said stator before entering said compression unit, wherein the stator core is provided with at least two stator support elements fixed to said stator core and extending in radial direction of said axis of rotation beyond an outer surface of said stator core for support of said stator on an inner sleeve surface of said motor housing sleeve without a weld therebetween, said at least two stator support elements together with said inner sleeve surface and said outer surface of said stator core forming a plurality of flow guiding channels that extend along said stator support elements of said electric motor, for guiding at least a portion of said refrigerant; and wherein the stator core is rotationally fixed to the motor housing sleeve at a predetermined angular orientation; and further comprising surface contact abutment at an interface between the stator support elements and the motor housing sleeve to provide for the predetermined angular orientation, wherein the surface contact abutment rotationally fixes the stator relative to the motor housing sleeve.
 17. Compressor in accordance with claim 15, wherein each of the flow guiding channels define a channel depth radially between said inner sleeve surface and said outer surface of said stator core, wherein the channel depth remains substantially constant over a circumferential span for each of the flow guiding channels as between respective pairs of the least two stator support elements.
 18. Compressor in accordance with claim 16, wherein the at least two stator support elements are fixed to said stator core by being integrally manufactured as one piece with laminations forming said stator core.
 19. Compressor in accordance with claim 16, wherein each of the flow guiding channels define a channel depth radially between said inner sleeve surface and said outer surface of said stator core, wherein the channel depth remains substantially constant over a circumferential span for each of the flow guiding channels as between respective pairs of the at least two stator support elements.
 20. Compressor according to claim 16, wherein the surface contact abutment comprises a tongue and groove interlocking at the interface.
 21. Compressor according to claim 16, wherein the surface contact abutment comprises a friction fit at the interface.
 22. Compressor according to claim 16, wherein the surface contact abutment comprises a press fit at the interface. 